<template>
  <div class="add">
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>商品添加</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 消息提示 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 进度条区域 给activeIndex添一个+号会自动转为数字-->
      <el-steps :space="200" :active="+activeIndex" finish-status="success" align-center>
        <el-step title="基本属性"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- 表单 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <!-- tab栏区域 -->
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClick"
        >
          <el-tab-pane label="基本属性" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name" style="width: 20rem"></el-input>
            </el-form-item>
            <el-form-item label="商品价格">
              <el-input v-model="addForm.goods_price" type="number" style="width: 20rem"></el-input>
            </el-form-item>
            <el-form-item label="商品重量">
              <el-input v-model="addForm.goods_weight" type="number" style="width: 20rem"></el-input>
            </el-form-item>
            <el-form-item label="商品数量">
              <el-input v-model="addForm.goods_number" type="number" style="width: 20rem"></el-input>
            </el-form-item>
            <el-form-item label="商品介绍">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="catesList"
                :props="catesProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- 图片上传 -->
            <el-upload
              :action="uploadRUL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headers"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品介绍" name="4">
            <quill-editor v-model="addForm.goods_introduce" />
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex: '0',
      // 添加表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品分类所属数组
        goods_cat: [],
        // 存放图片信息
        pics: [],
        // 商品详情
        goods_introduce: '',
        attrs: []
      },
      // 表单验证规则
      addFormRules: {
        goods_name: [
          {
            required: true,
            trigger: 'blur'
          }
        ]
      },
      // 商品分类列表
      catesList: [],
      // 级联选择框
      catesProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 图片上传到的路径
      uploadRUL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 由于el-upload使用的请求方式和main.js中的不一样,因此要为它,设置一个请求头属性
      headers: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 缩略图的路径
      previewPath: '',
      // 控制缩略图的隐藏与显示
      previewVisible: false
    }
  },
  created () {
    this.getCatesList()
  },
  methods: {
    async getCatesList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status === 200) {
        this.catesList = res.data
      }
    },
    // 级联选择器选中变化,会触发这个函数
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // 点击右侧名称进行切换的代码逻辑
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请按照顺序填写')
        return false
      }
    },
    async tabClick () {
      // 证明访问的是动态面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' }
          }
        )
        if (res.meta.status === 200) {
          res.data.forEach(item => {
            item.attr_vals =
              item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
          })
          this.manyTableData = res.data
        }
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' }
          }
        )
        if (res.meta.status === 200) {
          this.onlyTableData = res.data
        }
      }
    },
    // 控制缩略图预览
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 移除图片
    handleRemove (file) {
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.temp_path
      // 2.从pics数组中,找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3. 调用数组的splice方法,把图片信息对象,从pics数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess (response) {
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象,push到pics数组中
      this.addForm.pics.push(picInfo)
    },
    // 添加商品
    async add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请把表单必要项填写完整')
        }
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // 发起请求添加商品
        // 商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status === 201) {
          this.$message.success('添加商品成功')
          this.$router.push('/goods')
        }
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped lang="less">
.el-checkbox {
  margin: 0 2rem 0 0 !important;
}
.previewImg {
  width: 100%;
}
.el-button {
  margin-top: 1rem;
}
</style>
